Luminescent materials
AssigneeLumileds Holding B.V.
InventorsChristoph Martiny, Peter Josef Schmidt, Christian Maak, Wolfgang Schnick
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Abstract
Embodiments of the invention are directed to a luminescent ceramic including a first phase and a second phase. The first phase is R3−x−y−z+w2A1.5x+y−w2MzSi6−w1−w2Alw1−w2N11−y−w1Oy+w1. R is selected from the group comprising trivalent La, Gd, Tb, Y, Lu; A is selected from the group comprising bivalent Ca, Mg, Sr, Ba, and Eu; and M is selected from the group comprising trivalent Ce, Pr and Sm. The second phase may be or comprise, for example, RE3ASi5N9O2 and RESi3N5, wherein RE is at least one rare-earth element selected from the group consisting of La, Gd, Lu, Y, Ce and Sc and wherein A is at least one metal element selected from the group consisting of Ba, Sr, Ca, Mg, Zn and Eu.
Claims20
A luminescent ceramic comprising:
- a first phase comprising RE3−x−y−z+w2A1.5x+y−w2MzSi6−w1−w2Alw1+w2N11−y−w1Oy+w1 and a dopant, wherein:
- 0≤x≤2;
- 0≤y≤3;
- 0≤z≤3;
- 0≤w1≤6;
- 0≤x+y+z−w2≤3;
- 0≤w1+w2≤6;
- 0≤w2≤x+y≤3;
- R is selected from the group of trivalent La, Gd, Tb, Y, and Lu, and combinations thereof;
- A is selected from the group of bivalent Ca, Mg, Sr, Ba, and Eu;
- M is selected from the group of trivalent Ce, Pr and Sm;
- and
- a second phase comprising at least one material selected from the group consisting of RE4−xAxSi5−wAlwN10−x−wO1+x+w, 0≤x≤4, 0≤w≤5, RE3A1−x/2Si5−wAlwN9−x−wO2+x+w, 0≤x≤2, 0≤w≤5, and RE1−xAxSi3−wAlwN5−x−wOx+w, 0≤x≤1, 0≤w≤3, 0≤x+w≤3, wherein RE is at least one rare-earth element selected from the group consisting of La, Gd, Lu, Y, Ce and Sc and wherein A is at least one metal element selected from the group consisting of Ba, Sr, Ca, Mg, Zn and Eu.
A light source comprising:
- a light emitting diode that emits blue light;
- and
- a wavelength converting structure comprising a luminescent ceramic disposed in a path of the blue light, the luminescent ceramic comprising:
- a first phase comprising R3−x−y−z+w2A1.5x+y−w2MzSi6−w1−w2Alw1−w2N11−y−w1Oy+w1 and a dopant, wherein:
- 0≤x≤2;
- 0≤y≤3;
- 0≤z≤3;
- 0≤w1≤6;
- 0≤x+y+z−w2≤3;
- 0≤w1+w2≤6;
- 0≤w2≤x+y≤3;
- R is selected from the group of trivalent La, Gd, Tb, Y, and Lu, and combinations thereof;
- A is selected from the group of bivalent Ca, Mg, Sr, Ba, and Eu;
- M is selected from the group of trivalent Ce, Pr and Sm;
- and
- a second phase comprising at least one material selected from the group consisting of RE4−xAxSi5−wAlwN10−x−wO1+x+w, 0≤x≤4, 0≤w≤5, RE3A1−x/2Si5−wAlwN9−x−wO2+x+w, 0≤x≤2, 0≤w≤5, and RE1−xAxSi3−wAlwN5−x−wOx+w, 0≤x≤1, 0≤w≤3, 0≤x+w≤3, wherein RE is at least one rare-earth element selected from the group consisting of La, Gd, Lu, Y, Ce and Sc and wherein A is at least one metal element selected from the group consisting of Ba, Sr, Ca, Mg, Zn and Eu.
Dependencies are inferred from the claim text.